Multiple Choice 1. An empty tank is slowly filled with air. Water is then added

Question

Multiple Choice 1. An empty tank is slowly filled with air. Water is then added to the tank, decreasing the volume for the air in the tank. The temperature remains constant. What happens to the pressure? The pressure increases. ) The pressure doesn't change. c) The pressure decreases. d) Pressure has nothing to do with this problem 2. An empty tank is filled with air, and then placed in a freezer for 8 hours. What happens to the pressure? a) The pressure increases b) The pressure doesn't change. c) The pressure decreases. d) Pressure has nothing to do with this problem 3. A container with a piston is filled with hydraulic fluid. The fluid is then heated up with a blow torch. What happens with the piston if the pressure is constant? a) The temperature of the fluid decreases. b) The piston will rise. c) The pressure will increase. d) The piston will drop. 4. A block of aluminum is placed in a ban of boiling water. What will happen to the block of aluminum? a) The block will get larger while in the water. b) The block is going to retain the heat applied to it. c) The block will change properties. d) None of the above.

Explanation / Answer

1) a) The pressure increases.

At constant pressure, P*V = constant

P2*V2 = P1*V1

P2 = P1*(V1/V2)

as water is filled, V2 < V1

so, P2 > P1

2) c) The pressure decreases.

At constant volume

P/T = constant

P2/T2 = P1/T1

P2 = P1*(T2/T1)

as T2 < T1

P2 < P1

so, pressure decreases.

3) b) The piston will rise

4) a) The block will get larger in the water.

because, as the temperature increases the block expands.

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